[huhnmonster]

There are a bunch of other technologies as well. Huge flywheels [1], which are supposed to be used for very responsive power needs (i.e. grid stabilisation), trains loaded with weights which get pulled up a mountain and released [2], redox-flow batteries and so on.

[1]: https://www.energydigital.com/smart-energy/worlds-largest-fl... [2]: https://aresnorthamerica.com/

[timr]

Also molten salt:

https://www.solarthermalworld.org/news/molten-salt-storage-3...

People talk about making "personal" molten salt units for the home, which seems a little terrifying.

[jandrese]

I wonder what the local zoning commission has to say about the guy building a personal toxic metal death ray in his backyard?

[taeric]

Seems the train idea is similar to the old counterbalance system for trollies in Seattle.

[imtringued]

Hydro pump storage works because you don't have to pay for the weights. Building a train is worse than batteries in terms of economics.